Chemical Forums

Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: tpowell on July 09, 2011, 06:43:27 PM

Title: Calculate Initial pH, pH at midpoint and pH at equivalence point
Post by: tpowell on July 09, 2011, 06:43:27 PM

A 50.00 mL of 0.172 M HNO3 was titrated with 0.206 M NaOH. Determine pH of the solution at the following point during the titration. - Recall that HNO3 is a strong acid, and ionizes completely. Thus, the pH calculations during the titration are simpler than those for a weak acid like acetic acid. -

Volume of base needed to reach the Equivalence Point    mL    
Volume of base needed to reach the mid-point to the Eq. Pt.    mL    
pH before addition of the base       
pH at the midway point       
pH at the equivalence point       

The volume of base needed to reach equivalence point and midpoint are 41.75mL and 20.87mL respectively, and the initial pH is 0.764. I'm having trouble figuring out how to calculate the pH at the midpoint and at the equivalence point though. Any ideas? Thanks!

Title: Re: Calculate Initial pH, pH at midpoint and pH at equivalence point
Post by: enahs on July 09, 2011, 11:08:50 PM

http://www.titrations.info/